package string;

public class StringBuilderDemo {
    public static void main(String[] args) {
        String str="好好学习Java";
        StringBuilder builder=new StringBuilder(str);
        //在末尾追加
        builder.append(",为了找个好工作");
        System.out.println(builder);
        //替换 换头不换尾
        builder.replace(9,16,"就是为了改变世界");
        System.out.println(builder);
        //删除部分内容 含头不含尾
        builder.delete(0,8);
        System.out.println(builder);
        //插入
        builder.insert(0,"活着");
        System.out.println(builder);



        /*
        StringBuilder builder1 = new StringBuilder();
        StringBuilder builder2 = new StringBuilder("abc");
        //String和StringBuilder互转
        String str="abc";
        StringBuilder builder3=new StringBuilder(str);
        String str2=builder3.toString();*/
    }
}
